Keyboard



FIG. 1 is a perspective view of a keyboard showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a front elevational view thereof; and,

FIG. 6 is a rear elevational view thereof.

The bottom of the keyboard forms no part of the claimed design. The broken line disclosure in all views is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a keyboard, as shown and described. 